[XenonSurf]

I understand that when being on periscope depth or a bit higher to compensate for rough sea, then you should barely spot any surface objects about 20-30 ky away when deploying your radar and ESM mast. Earth curvature is the reason of course, plus a little bonus or malus distance for wave interferences that you may also capture, or not capture in bad weather conditions.
For passive ESM I understand that only warships or airbornes activeley emmit radio signals, merchants and other unarmed ships do not for obvious stealth reasons.
As for the periscope, the distance you can see objects is further reduced due to its little height above water.

However, when I completly surface my sub, the picture should change drastically. Now with all masts deployed I should spot any ship at 30-60 ky away, all masts being much higher, and all other conditions remaining the same. Plus I could receive satellite transmissions showing me the last target's situation and course!

This increased radar and active ESM range when the sub is on the surface seems to be not modelled in the game, please developers add this.
Subs are very restricted for hunting their targets, so taking away a main physical mean to spot targets is restricting them even further.

Or is there something I oversee, and all is fine in the current state? What do you think?

Thanks,